Install libraries


Attaching package: ‘dplyr’

The following objects are masked from ‘package:stats’:

    filter, lag

The following objects are masked from ‘package:base’:

    intersect, setdiff, setequal, union

Warning: stack imbalance in 'lazyLoadDBfetch', 20 then 18
Registered S3 method overwritten by 'data.table':
  method           from
  print.data.table     
Registered S3 method overwritten by 'htmlwidgets':
  method           from         
  print.htmlwidget tools:rstudio
Attaching SeuratObject

Downloading Data

We would like to include two datasets: TO_1, which is a erebral organoid with H841 cells, and TO_2, which is H841 cells growing in 2D for a comparison. We will download both and save as Seurat objects, but in this notebook we’ll focus on TO_1. In another notebook, we’ll integrate the two datasets so we can directly compare them.

To use this code, change the directory indir below.

I am using Seurat to read in the data, and since the format is similar to 10X (a folder with matrix, barcodes, and features), I’m using the Read10X function. Interestingly, the data contains multiple labels for the genes, so it gets returned as a list containing matrices of each type. We mostly care about the protein_coding list, so we will build a Seurat object using just those genes, and filter out cells with fewer than 200 features, and genes with counts in fewer than 3 cells.

indir <- "/Users/smgroves/Dropbox (VU Basic Sciences)/Quaranta_Lab/SCLC_data/scRNAseq/2022_pipseq_organoids/20220714_Quaranta_8332_pipseq/"
# raw_counts<-read.table(file=paste0(indir,"8332_TO_1/raw_matrix/matrix.mtx"),sep=",")
# 
# head(raw_counts)

expression_matrix <- Read10X(data.dir = paste0(indir,"8332_TO_1/filtered_matrix/sensitivity_1"))
10X data contains more than one type and is being returned as a list containing matrices of each type.
data <- CreateSeuratObject(counts = expression_matrix$protein_coding, project = "TO_1", min.cells = 3, min.features = 200)
data
An object of class Seurat 
15778 features across 2085 samples within 1 assay 
Active assay: RNA (15778 features, 0 variable features)
expr_2d <-Read10X(data.dir = paste0(indir,"8332_TO_2/filtered_matrix/sensitivity_1"))
10X data contains more than one type and is being returned as a list containing matrices of each type.
data2d <- CreateSeuratObject(counts = expr_2d$protein_coding, project = "TO_2", min.cells = 3, min.features = 200)
data2d
An object of class Seurat 
16290 features across 4236 samples within 1 assay 
Active assay: RNA (16290 features, 0 variable features)

It looked like this filtered the protein-coding genes from 20024 to 15778 and did not filter cells (which makes sense, since we are using filtered data already from PIPseeker.) For the 2D data, the data is reduced from 20024 x 4236 to 16290 x 4236.

We can check at this point how many counts we find for each of the four TFs (ANPY).

[1] "ASCL1 counts:"
[1] 0
[1] "NEUROD1 counts:"
[1] 0
[1] "POU2F3 counts:"
[1] 8
[1] "YAP1 counts:"
[1] 829

We find that ASCL1 and NEUROD1 are dropped out of this dataset or are unexpressed.

Preprocessing

Quality Control

First we’ll do QC. This was already done with PIPseeker, so we probably don’t need to filter anything else.

# Visualize QC metrics as a violin plot
VlnPlot(data, features = c("nFeature_RNA", "nCount_RNA"), ncol = 2)

FeatureScatter(data, feature1 = "nCount_RNA", feature2 = "nFeature_RNA")

Normalization and Scaling

We will normalize the data (log-transform), find the highly variable features, and then scale the data. The Seurat object retains the normalized data in data[["RNA"]]@data, and will keep the scaled data in data[["RNA"]]@scale.data.

data <- NormalizeData(data, normalization.method = "LogNormalize", scale.factor = 10000)
Performing log-normalization
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|

Plotting genes of interest

We can plot POU2F3 and YAP1 after normalization. These plots will be more interesting later, when we can look at different clusters in the data.

VlnPlot(data, features = c("POU2F3", "YAP1"))

Finding variable genes

all.genes <- rownames(data)
data <- ScaleData(data, features = all.genes)
Centering and scaling data matrix

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Dimensionality reduction and plotting

Run a PCA

After running a PCA, look at the genes driving the variance in the top dimensions.

data <- RunPCA(data, features = VariableFeatures(object = data))
PC_ 1 
Positive:  HMGB2, UBE2C, H2AZ1, PIMREG, BIRC5, PBK, TUBA1B, RRM2, TOP2A, KPNA2 
       SNRPG, CKS1B, CCNB1, RAN, MAD2L1, PTTG1, CDCA3, CDKN3, PCNA, TYMS 
       CENPM, TUBA1C, NDC80, MCM7, SPC25, HMGB1, KIF2C, CKS2, UBE2T, NUF2 
Negative:  RPL32, RPS27, RPL36A, H2AC19, RPL17, H2AC18, RPS3A, H1-2, RPL17-C18orf32, RPS29 
       IFI27L2, H2AC6, H2AC8, H2BC5, ISG15, TMEM88, EIF4A2, ICAM4, CYSTM1, APOE 
       CDKN2C, LGALS1, MKNK2, VIM, PIFO, HOATZ, TMSB10, H2AW, TUBA1A, MTERF2 
PC_ 2 
Positive:  CALD1, CAPG, DHRS2, COMMD6, BEX1, CCN2, MARCKS, CAV1, ALDH7A1, ARG2 
       ID4, ACAT2, MOXD1, TIMM8B, RPL23, SELENOW, SGK1, UACA, CCN1, CAV2 
       CRABP1, PROCR, GSTM3, EDN1, HDDC2, JPH4, SOX4, RBMS3, PIH1D1, SHISAL2B 
Negative:  APOC1, FTL, CYSTM1, HOATZ, RPS3A, ENSG00000287856, PBX3, MAP2, NQO1, FTH1 
       AHCYL1, BLVRB, SMARCA1, APOE, PRDX1, PLA2G12A, RPL32, TMEM88, ITGAV, HLA-B 
       TRIM9, GAR1, GASK1B, CLIP4, RPL17-C18orf32, MACF1, FNIP2, RPL17, TENM3, TXNRD1 
PC_ 3 
Positive:  MT-CO3, MT-ND3, MT-CO2, RPS3A, MT-CYB, MT-ATP6, RPL32, PTTG1, RPL17, MT-ND4 
       MT-ND2, RPL17-C18orf32, MT-CO1, CDKN3, HMGN2, MT-ND1, SNRPG, PRDX1, STMN1, RPL36A 
       CKS1B, RPS7, RPS27, TUBA1B, HMGB2, CCNB2, PSMA3, CHCHD2, CDC20, CCNB1 
Negative:  SLC38A2, CCN2, CALD1, ENC1, ITM2B, RAPGEF2, CELF2, HMGA2, TENM3, CCN1 
       ACTG1, YAP1, CDK6, ERBB4, CAV1, DHRS2, LHFPL6, SCD, BEX1, CAV2 
       VIM, EPB41L2, ATP9A, ID4, NRG1, ZFP36L1, CAPG, ENAH, APBB2, UACA 
PC_ 4 
Positive:  TXN, FTL, PRDX1, SLIRP, MYL12B, FTH1, COX7A2, HSP90AB1, PPIA, HSPB1 
       HSP90AA1, SOD1, CHCHD2, HSPE1-MOB4, ACTB, HSPE1, TXNDC17, CYCS, HSPD1, ENO1 
       SNRPG, TMSB4X, GSTP1, SUN3, PSMA7, EIF5A, CCT5, TIMM8B, DBI, OSGIN1 
Negative:  RPS27, RPL36A, UBE2C, TOP2A, HMGB2, NDC80, CDK1, RPL32, KIF2C, AURKA 
       RPS3A, IFI27L2, CDCA8, RPS29, RACGAP1, RPL17-C18orf32, SGO2, CCNA2, CKS2, ASPM 
       SPC25, ENSG00000273269, RPL17, ARL6IP1, NEK2, HJURP, KNSTRN, HMMR, NUF2, PSRC1 
PC_ 5 
Positive:  PCNA, H4C3, DHFR, GINS2, TK1, RFC2, MCM4, CENPU, RPS4Y1, MCM6 
       RFC4, RAD51AP1, MCM3, CENPK, CDC6, GMNN, RRM2, MCM7, RPL17, ACYP1 
       MCM2, MCM10, RIBC2, RPS3A, DUT, RFC5, RPA2, CLSPN, DSN1, DTL 
Negative:  CCNB1, KIF20A, PTTG1, CDC20, PLK1, H2AC6, H2BC5, ARL6IP1, ASPM, AURKA 
       SOX4, CCNB2, KPNA2, PDP1, H2AW, TPX2, DLGAP5, MORF4L2, CDKN3, NEK2 
       BAMBI, HNRNPA2B1, PIF1, CCNA2, CENPF, RAD21, NUCKS1, KNSTRN, CKS2, EMP1 
VizDimLoadings(data, dims = 1:2, reduction = "pca")

DimPlot(data, reduction = "pca")


DimHeatmap(data, dims = 1:5, cells = 500, balanced = TRUE)

Pick dimensionality

Using two methods, we’ll evaluate the best number of top PCs to keep for further analysis. None of the data will be lost, but our analyses like UMAP/tSNE below will only use the top N PCs for computational efficiency. Usually we keep between 10-30.

# NOTE: This process can take a long time for big datasets, comment out for expediency. More
# approximate techniques such as those implemented in ElbowPlot() can be used to reduce
# computation time
data <- JackStraw(data, num.replicate = 100)
data <- ScoreJackStraw(data, dims = 1:20)
JackStrawPlot(data, dims = 1:15)

ElbowPlot(data)

All of the top 15 PCs are well above the dotted line (normal distribution), and there is potentially an elbow in the elbow plot between 6-9 PCs. We’ll keep 10 just to be safe.

Clustering

More information about the clustering method (Louvain) can be found in the Seurat tutorial. When you make a new DimPlot, the cells will automatically be colored by these new labels.

data <- FindNeighbors(data, dims = 1:10)
data <- FindClusters(data, resolution = 0.5)
DimPlot(data, reduction = "pca")

Running a UMAP and tSNE Dmensionality Reduction

data <- RunUMAP(data, dims = 1:10)
DimPlot(data, reduction = "umap")

We can now plot our features of interest on the UMAP:

Let’s also save the output of this notebook so far:

saveRDS(data, file = "./data/TO_1.rds")

Differentially Expressed Markers by Cluster

data.markers <- FindAllMarkers(data, only.pos = TRUE, min.pct = 0.25, logfc.threshold = 0.25)
data.markers %>%
    group_by(cluster) %>%
    slice_max(n = 4, order_by = avg_log2FC)
NA
data.markers %>%
    group_by(cluster) %>%
    top_n(n = 10, wt = avg_log2FC) -> top10
DoHeatmap(data, features = top10$gene) + NoLegend()

Clusters 0, 2, 3, 4, and 6

  • Enriched in 0: H1-2, H2AC18, H2AC19, MT-ND3: histone stuff and mitochondrial gene
  • Enriched in 2:FTL, PTTG1, FTH1, HOATZ
    • FTL: This gene encodes the light subunit of the ferritin protein. Ferritin is the major intracellular iron storage protein in prokaryotes and eukaryotes
    • PTTG1: Regulatory protein, which plays a central role in chromosome stability, in the p53/TP53 pathway, and DNA repair.
    • FTH1: This gene encodes the heavy subunit of ferritin
    • HOATZ: Required for motile ciliogenesis and flagellar genesis by mediating the maturation of the glycolytic enzyme ENO4.
  • Enriched in 3: MAP2, PEG10, CYSTM1, TENM3
  • Enriched in 4: PCNA, RRN2, CENPU, DHFR
  • Enriched in 6: HMGB2, UBE2C, CCNB1, KPNA2

Clusters 1 and 7

  • Enriched in 1: BEX1, CAV1, CCN2, DHRS2
    • BEX1: Signaling adapter molecule involved in p75NTR/NGFR signaling. Plays a role in cell cycle progression and neuronal differentiation. Inhibits neuronal differentiation in response to nerve growth factor (NGF). May act as a link between the cell cycle and neurotrophic factor signaling, possibly by functioning as an upstream modulator of receptor signaling, coordinating biological responses to external signals with internal cellular states (Muller glia cells, brain, pituitary gland).
    • CAV1: Caveolin-1,major component of caveolae; endocytosis, maintain cell structure, etc. The protein links integrin subunits to the tyrosine kinase FYN, an initiating step in coupling integrins to the Ras-ERK pathway and promoting cell cycle progression. The gene is a tumor suppressor gene candidate and a negative regulator of the Ras-p42/44 mitogen-activated kinase cascade. (Adipocytes and endothelial cells)
    • CCN2: The protein encoded by this gene is a mitogen that is secreted by vascular endothelial cells. The encoded protein plays a role in chondrocyte proliferation and differentiation, cell adhesion in many cell types, and is related to platelet-derived growth factor. (Fibroblasts, smooth muscle cells, adipocytes)
    • DHRS2: dehydrogenases/reductases (SDR) family (Fibroblasts, urinary)
  • Enriched in 7: CALD1, DHRS2, UACA, SGK1
    • CALD1: This gene encodes a calmodulin- and actin-binding protein that plays an essential role in the regulation of smooth muscle and nonmuscle contraction. (Smooth muscle cells, Sertoli cells, endocrine cells)
    • UACA: This gene encodes a protein that contains ankyrin repeats and coiled coil domains and likely plays a role in apoptosis. (High in adipocytes, endothelial, cardiomyocytes, microglial cells)
    • SGK1: This gene encodes a serine/threonine protein kinase that plays an important role in cellular stress response. This kinase activates certain potassium, sodium, and chloride channels, suggesting an involvement in the regulation of processes such as cell survival, neuronal excitability, and renal sodium excretion.(Langerhans cells, enterocytes)

Cluster 5

  • Enriched in 5: EMP1, DHRS2, SOX4, CCDC167
    • EMP1: Involved in bleb assembly and cell death. Located in plasma membrane. (esophagus, epithelial)
    • SOX4:regulation of embryonic development (lymphoid tissue, ionocytes, endocrine cells)
    • CCDC167: Predicted to be integral component of membrane. (Brain and lymphoid)
saveRDS(data, file = "./data/TO_1.rds")
saveRDS(data2d, file = "./data/TO_2.rds")
sessionInfo()
R version 4.1.1 (2021-08-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] patchwork_1.1.1    SeuratObject_4.0.4 Seurat_4.0.5      
[4] dplyr_1.0.7       

loaded via a namespace (and not attached):
  [1] Rtsne_0.15            colorspace_2.0-2      deldir_1.0-6         
  [4] ellipsis_0.3.2        ggridges_0.5.3        rstudioapi_0.13      
  [7] spatstat.data_2.1-0   leiden_0.3.9          listenv_0.8.0        
 [10] farver_2.1.0          ggrepel_0.9.1         RSpectra_0.16-0      
 [13] fansi_1.0.2           codetools_0.2-18      splines_4.1.1        
 [16] knitr_1.36            polyclip_1.10-0       jsonlite_1.7.3       
 [19] ica_1.0-2             cluster_2.1.2         png_0.1-7            
 [22] uwot_0.1.11           shiny_1.7.1           sctransform_0.3.2    
 [25] spatstat.sparse_2.0-0 compiler_4.1.1        httr_1.4.2           
 [28] assertthat_0.2.1      Matrix_1.3-4          fastmap_1.1.0        
 [31] lazyeval_0.2.2        cli_3.1.1             limma_3.48.3         
 [34] later_1.3.0           htmltools_0.5.2       tools_4.1.1          
 [37] igraph_1.2.11         gtable_0.3.0          glue_1.6.1           
 [40] RANN_2.6.1            reshape2_1.4.4        Rcpp_1.0.8           
 [43] scattermore_0.7       jquerylib_0.1.4       vctrs_0.3.8          
 [46] nlme_3.1-153          lmtest_0.9-39         xfun_0.28            
 [49] stringr_1.4.0         globals_0.14.0        mime_0.12            
 [52] miniUI_0.1.1.1        lifecycle_1.0.1       irlba_2.3.5          
 [55] goftest_1.2-3         future_1.23.0         MASS_7.3-54          
 [58] zoo_1.8-9             scales_1.1.1          spatstat.core_2.3-2  
 [61] promises_1.2.0.1      spatstat.utils_2.2-0  parallel_4.1.1       
 [64] RColorBrewer_1.1-2    yaml_2.2.1            reticulate_1.23      
 [67] pbapply_1.5-0         gridExtra_2.3         ggplot2_3.3.5        
 [70] sass_0.4.0            rpart_4.1-15          stringi_1.7.6        
 [73] rlang_0.4.12          pkgconfig_2.0.3       matrixStats_0.61.0   
 [76] evaluate_0.14         lattice_0.20-45       ROCR_1.0-11          
 [79] purrr_0.3.4           tensor_1.5            htmlwidgets_1.5.4    
 [82] labeling_0.4.2        cowplot_1.1.1         tidyselect_1.1.1     
 [85] parallelly_1.30.0     RcppAnnoy_0.0.19      plyr_1.8.6           
 [88] magrittr_2.0.1        R6_2.5.1              generics_0.1.1       
 [91] DBI_1.1.1             pillar_1.6.4          withr_2.4.3          
 [94] mgcv_1.8-38           fitdistrplus_1.1-6    survival_3.2-13      
 [97] abind_1.4-5           tibble_3.1.6          future.apply_1.8.1   
[100] crayon_1.4.2          KernSmooth_2.23-20    utf8_1.2.2           
[103] spatstat.geom_2.3-1   plotly_4.10.0         rmarkdown_2.11       
[106] grid_4.1.1            data.table_1.14.2     digest_0.6.29        
[109] xtable_1.8-4          tidyr_1.1.4           httpuv_1.6.3         
[112] munsell_0.5.0         viridisLite_0.4.0     bslib_0.3.1          
---
title: "Introduction to Visualization and Data Exploration"
author: "Sarah Groves"
date: "7/22/2022"
output: 
    html_notebook:
        toc: yes
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

# Install libraries

```{r install, echo = FALSE}
# if these are not installed, uncomment the lines below to install them
#install.packages("devtools")
#install.packages("dplyr")
#install.packages('Seurat')
#devtools::install_github("thomasp85/patchwork")
if (!require("BiocManager", quietly = TRUE))
    install.packages("BiocManager")
library(dplyr)
library(Seurat)
library(patchwork)
```

# Downloading Data

We would like to include two datasets: TO_1, which is a erebral organoid with H841 cells, and TO_2, which is H841 cells growing in 2D for a comparison. We will download both and save as Seurat objects, but in this notebook we'll focus on TO_1. In another notebook, we'll integrate the two datasets so we can directly compare them.

To use this code, change the directory `indir` below.

I am using Seurat to read in the data, and since the format is similar to 10X (a folder with matrix, barcodes, and features), I'm using the Read10X function. Interestingly, the data contains multiple labels for the genes, so it gets returned as a list containing matrices of each type. We mostly care about the `protein_coding` list, so we will build a Seurat object using just those genes, and filter out cells with fewer than 200 features, and genes with counts in fewer than 3 cells.

```{r load-data}
indir <- "/Users/smgroves/Dropbox (VU Basic Sciences)/Quaranta_Lab/SCLC_data/scRNAseq/2022_pipseq_organoids/20220714_Quaranta_8332_pipseq/"
# raw_counts<-read.table(file=paste0(indir,"8332_TO_1/raw_matrix/matrix.mtx"),sep=",")
# 
# head(raw_counts)

expression_matrix <- Read10X(data.dir = paste0(indir,"8332_TO_1/filtered_matrix/sensitivity_1"))
data <- CreateSeuratObject(counts = expression_matrix$protein_coding, project = "TO_1", min.cells = 3, min.features = 200)
data

expr_2d <-Read10X(data.dir = paste0(indir,"8332_TO_2/filtered_matrix/sensitivity_1"))
data2d <- CreateSeuratObject(counts = expr_2d$protein_coding, project = "TO_2", min.cells = 3, min.features = 200)
data2d


```
 It looked like this filtered the protein-coding genes from 20024 to 15778 and did not filter cells (which makes sense, since we are using filtered data already from PIPseeker.) For the 2D data, the data is reduced from 20024 x 4236 to 16290 x 4236.
 
 We can check at this point how many counts we find for each of the four TFs (ANPY).
```{r echo = False}
ASCL1_counts <- sum(expression_matrix$protein_coding['ASCL1',])
NEUROD1_counts <- sum(expression_matrix$protein_coding['NEUROD1',])
POU2F3_counts <- sum(expression_matrix$protein_coding['POU2F3',])
YAP1_counts <- sum(expression_matrix$protein_coding['YAP1',])
print("ASCL1 counts:")
ASCL1_counts
print("NEUROD1 counts:")
NEUROD1_counts
print("POU2F3 counts:")
POU2F3_counts
print("YAP1 counts:")
YAP1_counts
```
We find that ASCL1 and NEUROD1 are dropped out of this dataset or are unexpressed.

# Preprocessing

## Quality Control
First we'll do QC. This was already done with PIPseeker, so we probably don't need to filter anything else. 
```{r qc}
# Visualize QC metrics as a violin plot
VlnPlot(data, features = c("nFeature_RNA", "nCount_RNA"), ncol = 2)
FeatureScatter(data, feature1 = "nCount_RNA", feature2 = "nFeature_RNA")

```
## Normalization and Scaling
We will normalize the data (log-transform), find the highly variable features, and then scale the data. The Seurat object retains the normalized data in `data[["RNA"]]@data`, and will keep the scaled data in `data[["RNA"]]@scale.data`.
```{r norm}
data <- NormalizeData(data, normalization.method = "LogNormalize", scale.factor = 10000)

```

## Plotting genes of interest

We can plot POU2F3 and YAP1 after normalization. These plots will be more interesting later, when we can look at different clusters in the data.

```{r genes-of-interest}
VlnPlot(data, features = c("POU2F3", "YAP1"))

```
## Finding variable genes

```{r variable-feature}

data <- FindVariableFeatures(data, selection.method = "vst", nfeatures = 2000)

# Identify the 10 most highly variable genes
top10 <- head(VariableFeatures(data), 10)

# plot variable features with and without labels
plot1 <- VariableFeaturePlot(data)
plot2 <- LabelPoints(plot = plot1, points = top10, repel = TRUE)
plot2
```

```{r scaling}
all.genes <- rownames(data)
data <- ScaleData(data, features = all.genes)
```

# Dimensionality reduction and plotting

## Run a PCA
 After running a PCA, look at the genes driving the variance in the top dimensions.
```{r pca}
data <- RunPCA(data, features = VariableFeatures(object = data))
VizDimLoadings(data, dims = 1:2, reduction = "pca")
DimPlot(data, reduction = "pca")

DimHeatmap(data, dims = 1:5, cells = 500, balanced = TRUE)

```
## Pick dimensionality
Using two methods, we'll evaluate the best number of top PCs to keep for further analysis. None of the data will be lost, but our analyses like UMAP/tSNE below will only use the top N PCs for computational efficiency. Usually we keep between 10-30.

```{r message = False, results='hide', fig.keep='all'}
# NOTE: This process can take a long time for big datasets, comment out for expediency. More
# approximate techniques such as those implemented in ElbowPlot() can be used to reduce
# computation time
data <- JackStraw(data, num.replicate = 100)
data <- ScoreJackStraw(data, dims = 1:20)
JackStrawPlot(data, dims = 1:15)
ElbowPlot(data)

```
All of the top 15 PCs are well above the dotted line (normal distribution), and there is potentially an elbow in the elbow plot between 6-9 PCs. We'll keep 10 just to be safe. 

## Clustering
More information about the clustering method (Louvain) can be found in the Seurat tutorial. When you make a new DimPlot, the cells will automatically be colored by these new labels.

```{r clustering, message = False, results='hide', fig.keep='all'}
data <- FindNeighbors(data, dims = 1:10)
data <- FindClusters(data, resolution = 0.5)
DimPlot(data, reduction = "pca")

```

## Running a UMAP and tSNE Dmensionality Reduction

```{r umap, message = False, results='hide', fig.keep='all'}
data <- RunUMAP(data, dims = 1:10)
DimPlot(data, reduction = "umap")

```
We can now plot our features of interest on the UMAP:

```{r umap-features-of-interest}
FeaturePlot(data, features = c("BEX1","YAP1", "HES1","REST"))
```

Let's also save the output of this notebook so far:
```{r save}
saveRDS(data, file = "./data/TO_1.rds")
```

# Differentially Expressed Markers by Cluster

```{r de-genes, message = False, results='hide',}
data.markers <- FindAllMarkers(data, only.pos = TRUE, min.pct = 0.25, logfc.threshold = 0.25)


```
```{r table-de}
data.markers %>%
    group_by(cluster) %>%
    slice_max(n = 4, order_by = avg_log2FC)

```
```{r}
data.markers %>%
    group_by(cluster) %>%
    top_n(n = 10, wt = avg_log2FC) -> top10
DoHeatmap(data, features = top10$gene) + NoLegend()
```

### Clusters 0, 2, 3, 4, and 6
- Enriched in 0: H1-2, H2AC18, H2AC19, MT-ND3: histone stuff and mitochondrial gene
- Enriched in 2:FTL, PTTG1, FTH1, HOATZ
  - FTL: This gene encodes the light subunit of the ferritin protein. Ferritin is the major intracellular iron storage protein in prokaryotes and eukaryotes
  - PTTG1: Regulatory protein, which plays a central role in chromosome stability, in the p53/TP53 pathway, and DNA repair.
  - FTH1: This gene encodes the heavy subunit of ferritin
  - HOATZ: Required for motile ciliogenesis and flagellar genesis by mediating the maturation of the glycolytic enzyme ENO4.
- Enriched in 3: MAP2, PEG10, CYSTM1, TENM3
- Enriched in 4: PCNA, RRN2, CENPU, DHFR
- Enriched in 6: HMGB2, UBE2C, CCNB1, KPNA2

### Clusters 1 and 7
- Enriched in 1: BEX1, CAV1, CCN2, DHRS2
    - BEX1: Signaling adapter molecule involved in p75NTR/NGFR signaling. Plays a role in cell cycle progression and neuronal differentiation. Inhibits neuronal differentiation in response to nerve growth factor (NGF). May act as a link between the cell cycle and neurotrophic factor signaling, possibly by functioning as an upstream modulator of receptor signaling, coordinating biological responses to external signals with internal cellular states (**Muller glia cells, brain, pituitary gland**).
    - CAV1: Caveolin-1,major component of caveolae; endocytosis, maintain cell structure, etc. The protein links integrin subunits to the tyrosine kinase FYN, an initiating step in coupling integrins to the Ras-ERK pathway and promoting cell cycle progression. The gene is a tumor suppressor gene candidate and a negative regulator of the Ras-p42/44 mitogen-activated kinase cascade. (**Adipocytes and endothelial cells**)
    - CCN2: The protein encoded by this gene is a mitogen that is secreted by vascular endothelial cells. The encoded protein plays a role in chondrocyte proliferation and differentiation, cell adhesion in many cell types, and is related to platelet-derived growth factor. (**Fibroblasts, smooth muscle cells, adipocytes**)
    - DHRS2:  dehydrogenases/reductases (SDR) family (**Fibroblasts, urinary**)
- Enriched in 7: CALD1, DHRS2, UACA, SGK1
  - CALD1: This gene encodes a calmodulin- and actin-binding protein that plays an essential role in the regulation of smooth muscle and nonmuscle contraction. (**Smooth muscle cells, Sertoli cells, endocrine cells**)
  - UACA: This gene encodes a protein that contains ankyrin repeats and coiled coil domains and likely plays a role in apoptosis. (**High in adipocytes, endothelial, cardiomyocytes, microglial cells**)
  - SGK1: This gene encodes a serine/threonine protein kinase that plays an important role in cellular stress response. This kinase activates certain potassium, sodium, and chloride channels, suggesting an involvement in the regulation of processes such as cell survival, neuronal excitability, and renal sodium excretion.(**Langerhans cells, enterocytes**)

### Cluster 5
- Enriched in 5: EMP1, DHRS2, SOX4, CCDC167
  - EMP1: Involved in bleb assembly and cell death. Located in plasma membrane. (**esophagus, epithelial**)
  - SOX4:regulation of embryonic development (**lymphoid tissue, ionocytes, endocrine cells**)
  - CCDC167: Predicted to be integral component of membrane. (**Brain and lymphoid**)
  
```{r save2}
saveRDS(data, file = "./data/TO_1.rds")
saveRDS(data2d, file = "./data/TO_2.rds")
```

```{r}
sessionInfo()

```

